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0.2 किग्रा द्रव को 135°C से 25°C तक ठंडा करने में द्रव से निकली ऊष्मीय ऊर्जा ज्ञात कीजिये। जबकि द्रव की विशिष्ट ऊष्मा 750 जूल/किग्रा °C है।

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ऊष्मीय ऊर्जा = पदार्थ का द्रव्यमान x पदार्थ की विशिष्ट ऊष्मा x पदार्थ की तापवृद्धि
उष्मीय ऊर्जा = Q = ?
पदार्थ का द्रव्यमान = 0.2 किग्रा
पदार्थ का विशिष्ट ऊष्मा = 750 जूल/किग्रा.°C = 110°C
Q = m x S x ∆t = 0.2 किग्रा. x 750 जूल x 110°C = 16500 जूल

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